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High-energy, few-cycle THz pulse generation by high-intensity (∼1018 W/cm2) femtosecond laser with plasma mirrors have received significant attention in recent years [1-3]. This novel THz source has the potential of generating large bandwidth millijoule pulse energies, opening up applications in THz nonlinear optics, single-shot imaging and spectroscopy [4]. Solid density plasma shaping has already...
Driving high-harmonics (HH) from Mn+ with IR lasers at 1.82 μm revealed the contribution of inner-shell 3p-3d and 3p-4s channels through an intensity increase at energies from 49 eV to 51 eV.
We investigate the behavior of resonant-induced harmonics from tin using driving lasers with tunable wavelengths. The intensity of the resonant harmonic is suppressed by the tuning laser wavelength around 1.8μm to understand the interaction dynamics of continuum electron with the autoionizing states.
We demonstrate intense broadband terahertz pulse generation from the interaction of high intensity femtosecond laser with solid density plasmas. We measure substantial enhancement of terahertz pulse energy (32 цJ/pulse) by using aligned copper nanorod targets.
Carbon molecules are used to generate intense high-order harmonics using driving lasers with 0.8 μm–1.71 μm wavelengths. By driving plasma of reduced size (∼200μm) with 1.71μm laser, we could extend the cutoff to ∼70eV, while reducing the peak intensity by only ∼31%.
We perform spectroscopic characterization of graphite plasma to study the species responsible for high-order harmonics generation. We observed that visible region contains vibrational transitions of C2 and C3 molecules. Under the same conditions, we found shorter delays are favorable for intense HHG.
We demonstrate large, continuous redshift of high-order harmonics generated from carbon plasma. These harmoinics also have high intensity stability, with the harmonic yield only doubling when increasing the driving laser intensity by ten times.
We observe continuous and strong redshift of high-order harmonics generated from carbon plasma, which may explain the high conversion efficiency that result from a resonance close to the pump laser wavelength.
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